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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f87f3be3c4ccbf8d8b61cf04f46e4d9ed5a71c58d04ae670845735a6617a75f' 
  AND token = 'EqYkrb/6LOWul85CvIXam6DpE7FBDnijubDWbmd/ihs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}